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The identification of carbide phases by XRD analysis as the method of assess the extent of the steel damage after long time in service

Pietryka I., Lisak J.

Archives of Foundry Engineering

2010

Vol. 10, iss. 3 spec.

283--288

After long time in service in contact in a superheated steam mechanical properties of materials decrease. Experiments revealed that the XRD analysis of electrochemically separated carbide phase is a rapid and informative method of evaluation the service condition of steel. Mechanical properties of ferritic and bainitic low-alloy steels are caused by many factors like: chemical composition, quantity and the kind of microstructural constituent, the precipitation hardening, substructure of matrix and index of matrix lattice defects. In this paper the results of investigations 13CrMo4-5 steel was shown. The material for research was taken from thermal power plant elements. Material A was after 150.000 hours of work as the pressure chamber in which was the temperature 530-580oC and the pressure was 12 MPa. Material B was after 250.000 hours of work as the pipeline of superheated steam. The temperature in this case was 530oC but the pressure was 12 MPa as well. The mechanical properties after long time service and changes in fine structure were tested. Parameters of carbide phase electrochemical separation in electrolytes solutions are presented in this work. The most relevant electrolyte and the far better conditions of extraction process were chosen taking into consideration the time needed to get considerable amount of carbide phase constituents. The identification of carbide phases was the special goal of this work. Identification of electrochemically separated carbide phases by means of the XRD analysis was used.

Revealing and evaluation of carbides in MAR M247 Ni based superalloy

Szczotok A.

Inżynieria Materiałowa

2007

Vol. 28, nr 3-4

468-471

The work presents carbide phases occurring in a structure of MAR M247 Ni based superalloy. The ways of revealing these phases and results of using optical, scanning electron and transmission microscopy as well as X-ray phase analysis for researches are presented (Fig. 1 + 10). The author's attention has been concentrated on the carbides morphology and places of occurrence.

W pracy przedstawiono fazy węglikowe występujące w strukturze nadstopu niklu MAR M247. Przedstawiono sposoby ujawniania tych faz i zaprezentowano wyniki zastosowania do badań mikroskopii optycznej, elektronowej skaningowej i transmisyjnej oraz rentgenowskiej analizy fazowej (rys. 1÷10). Skoncentrowano się na morfologii i miejscach występowania węglików.